US3673495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for measuring electrical energy consumption
Assignee: McGraw Edison Co
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Filing: 1971-02-24
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Granted: 1972-06-27
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Expires: 1991-02-24
Abstract
Abstract A current transformer is connected to an electrical power circuit to provide a measure of the current in the power circuit. The current measure is applied through a reversing switch and a diode rectifying bridge to a coulombmeter and is controlled by commutating the bridge with a voltage from a voltage transformer connected to the electrical power circuit. The connections are made to apply current to the coulombmeter during the portion of the current cycle that occurs during a selected voltage half cycle. The current measure is further controlled by a modulating circuit connected to respond to the voltage of the power circuit and to pulse modulate the current as a function of voltage level. A control means responds to a selected condition of the coulombmeter to reverse the control current connections to the coulombmeter. A reading means senses the number of reversal operations to thereby provide an indication of the total amount of energy consumed in the power circuit over a selected period.
Inventors
- 👤 Richard E Riebs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:41
CPC Classifications
G; G01; G01R; G01R21/00; G01R21/02; G01R21/127
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
184 words
An electrical power measuring system for measuring the electrical energy consumed by an electrical load comprising: a current means responsive to the load current for producing a control current varying as a function of said load current; a recording means connected to receive the control current for measuring electrical current received; a current control means connected between the current means and the recording means and responsive to an electrical input for controlling application of said control current to said recording means to apply control current to said recording means only when said electrical input is below a preselected level; a voltage sensing means responsive to the load voltage for producing a control voltage varying as a function of the level of said load voltage; a biasing means for continuously applying an electrical input above said preselected level to the current control means; and a pulse modulating means responsive to the control voltage for pulse modulating the electrical input of said biasing means to a level below the preselected level at a pulse rate varying as a function of the level of said control voltage.
Claim 2
Dependent Claim
184 words
An electrical power measuring system for measuring the electrical energy consumed by an electrical load comprising: a current means responsive to the load current for producing a control current varying as a function of said load current; a recording means connected to receive the control current for measuring electrical current received; a current control means connected between the current means and the recording means and responsive to an electrical input for controlling application of said control current to said recording means to apply control current to said recording means only when said electrical input is below a preselected level; a voltage sensing means responsive to the load voltage for producing a control voltage varying as a function of the level of said load voltage; a biasing means for continuously applying an electrical input above said preselected level to the current control means; and a pulse modulating means responsive to the control voltage for pulse modulating the electrical input of said biasing means to a level below the preselected level at a pulse rate varying as a function of the level of said control voltage.
Claim 3
Dependent Claim
51 words
An electrical power measuring system according to claim 1 for measuring electrical energy consumed in an alternating electrical power system also comprising a phase angle means for applying an electrical input above the preselected level during a selected portion of each cycle of the control voltage to the current control means.
Claim 4
Dependent Claim
53 words
An alternating electrical power measuring system according to claim 2 wherein said pulse modulating means is responsive to the average control voltage level to shunt the electrical input from the biasing means and the electrical input from the phase angle means at a pulse rate substantially proportional to said average control voltage level.
Claim 5
Dependent Claim
48 words
An alternating electrical power measuring system according to claim 3 wherein said current control means comprises a commutating circuit connected between the current means and the recording means and responsive to an electrical input above the preselected level to shunt said control current away from said recording means.
Claim 6
Dependent Claim
31 words
An alternating electrical power measuring system according to claim 4 wherein said current means is responsive to the load current to produce a control current substantially proportional to said load current.
Claim 7
Dependent Claim
21 words
An alternating electrical power measuring system according to claim 5 wherein said recording means comprises a current measuring and integrating device.
Claim 8
Dependent Claim
42 words
An electrical power measuring system according to claim 1 wherein said pulse modulating means comprises a multivibrator and shunting circuit connected to intermittently shunt the control current at a pulse rate varying as a function of the level of said control voltage.
Claim 9
Dependent Claim
48 words
An electrical power measuring system according to claim 1 wherein said pulse modulating means is responsive to the control voltage level to shunt the electrical input to the current control means from the biasing means at a pulse rate substantially proportional to the level of said control voltage.
Claim 10
Dependent Claim
52 words
An electrical power measuring system according to claim 1 wherein said current control means comprises a commutating circuit connected between the current means and the recording means and responsive to the electrical input to shunt said control current away from said recording means when said electrical input is above the preselected level.
Claim 11
Dependent Claim
30 words
An electrical power measuring system according to claim 1 wherein said current means is responsive to the load current to produce a control current substantially proportional to said load current.
Claim 12
Dependent Claim
48 words
An electrical power measuring system according to claim 10 for measuring energy consumption in an alternating electrical load circuit also comprising a phase angle means for applying an electrical input above the preselected level during a selected half cycle of said control voltage to the current control means.
Claim 13
Dependent Claim
32 words
An alternating electrical power measuring system according to claim 11 wherein said voltage sensing means is responsive to the load voltage to produce a control voltage substantially proportional to said load voltage.
Claim 14
Dependent Claim
47 words
An alternating electrical power measuring system according to claim 12 wherein said pulse modulating means is responsive to the control voltage level to shunt the electrical input from the biasing means and from the phase angle means at a rate substantially proportional to said cOntrol voltage level.
Claim 15
Dependent Claim
21 words
An alternating electrical power measuring system according to claim 13 wherein said recording means comprises a current measuring and integrating device.
Claim 16
Dependent Claim
58 words
An alternating electrical power measuring system according to claim 14 wherein said pulse modulating means comprises a multivibrator and shunting circuit connected to pulse modulate the electrical input from the biasing means and from the phase angle means by intermittently shunting said electrical inputs at a rate varying substantially proportionally to the average level of said control voltage.
Claim 17
Dependent Claim
58 words
An electrical power measuring system according to claim 10 wherein said current control means comprises a controllable commutating device responsive to the electrical input and connected to shunt said control current, and wherein said pulse modulating means is connected to shunt said electrical input at a pulse rate substantially proportional to the average level of said control voltage.
Claim 18
Dependent Claim
48 words
An electrical power measuring system according to claim 16 for measuring energy consumption in an alternating electrical load circuit also comprising a phase angle means for applying an electrical input above the preselected level during a selected half cycle of the control voltage to the current control means.
Claim 19
Dependent Claim
21 words
An alternating electrical power measuring system according to claim 17 wherein said recording means comprises a current measuring and integrating device.
Claim 20
Dependent Claim
160 words
An alternating electrical power measuring system for measuring the electrical energy consumed by an electrical load comprising: a current transformer connected to be responsive to the load current to produce a control current as an output; a current measuring and integrating device connected to receive the control current; a commutating circuit connected between the current transformer and the measuring device and responsive to an electrical input of one polarity to shunt said control current; a biasing means for continuously applying an electrical input having said one polarity to the commutating circuit; a voltage transformer connected to be responsive to the load voltage to produce a control voltage as an output; a multivibrator shunting circuit having a pulse rate proportional to the level of an input and connected to shunt the electrical input to the commutating circuit; and a rectifying bridge connected to rectify the control voltage and apply the rectified control voltage as an input to the multivibrator shunting circuit.
Claim 21
Dependent Claim
160 words
An alternating electrical power measuring system for measuring the electrical energy consumed by an electrical load comprising: a current transformer connected to be responsive to the load current to produce a control current as an output; a current measuring and integrating device connected to receive the control current; a commutating circuit connected between the current transformer and the measuring device and responsive to an electrical input of one polarity to shunt said control current; a biasing means for continuously applying an electrical input having said one polarity to the commutating circuit; a voltage transformer connected to be responsive to the load voltage to produce a control voltage as an output; a multivibrator shunting circuit having a pulse rate proportional to the level of an input and connected to shunt the electrical input to the commutating circuit; and a rectifying bridge connected to rectify the control voltage and apply the rectified control voltage as an input to the multivibrator shunting circuit.
Claim 22
Dependent Claim
55 words
An alternating electrical power measuring system according to claim 19 also comprising a phase angle means for applying the control voltage as an electrical input to the commutating circuit to thereby shunt the control current during the one polarity portion of said control voltage, and wherein said multivibrator shunting circuit also shunts said control voltage.
References Cited (Backward Citations)
US3500200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |